CN107707171B - A kind of electro-magnetic motor excitation unit and its parameter acquiring method - Google Patents
A kind of electro-magnetic motor excitation unit and its parameter acquiring method Download PDFInfo
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- CN107707171B CN107707171B CN201710881406.9A CN201710881406A CN107707171B CN 107707171 B CN107707171 B CN 107707171B CN 201710881406 A CN201710881406 A CN 201710881406A CN 107707171 B CN107707171 B CN 107707171B
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- excitation winding
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P25/00—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details
- H02P25/16—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the circuit arrangement or by the kind of wiring
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- Dc-Dc Converters (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
Abstract
The invention discloses a kind of electro-magnetic motor excitation unit and its parameter acquiring methods, comprising: excitation winding, excitation winding buck circuit, isolated form DC/DC converter, three-phase windings and bus power supply；Bus power supply is connected with three-phase windings, for providing busbar voltage for three-phase windings；The input terminal of isolated form DC/DC converter is connected with bus power supply, and output end is connected with the input terminal of excitation winding buck circuit, and the busbar voltage for providing bus power supply carries out isolation no-load voltage ratio using as excitation winding buck circuit input voltage；The output end of excitation winding buck circuit is connected with excitation winding, for carrying out copped wave to the busbar voltage after isolation no-load voltage ratio, using the voltage obtained after copped wave as the end voltage of excitation winding.The present invention eliminates the common mode access between energized circuit and three-phase circuit, inhibits common mode current, and consider the optimization of power device duty ratio, to reach better power device control performance.
Description
Technical field
The invention belongs to field of electromechanical technology, obtain more particularly, to a kind of electro-magnetic motor excitation unit and its parameter
Take method.
Background technique
Currently, electro-magnetic motor is used widely in high power density, high reliability field, in wind power plant, electronic vapour
It has broad application prospects in the fields such as vehicle, Ship Propeling, aerospace.General magneto has loss of excitation hidden danger, and magnet steel
At high cost, weak magnetic control is complicated.Compared with magneto, the freedom degree of the more exciting currents of electro-magnetic motor, this makes electricity
The control of excitation electromotor is more flexible.Due to the form using electrical excitation, there is no the losss of excitation being likely to occur in magneto, more
Add and is suitable for the application field stringent to reliability.In high-speed motor field, since the size of adjusting exciting current can be passed through
Realize weak magnetic control, control difficulty decline.Common electro-magnetic motor takes three-phase windings and excitation winding to share a direct current
The topological structure of power supply, there are the circuit that common mode current between excitation winding and three-phase windings circulates, this common mode current may be made
It, must be to this common mode current when electric machine control system designs and manufactures at the damage of winding insulation and the vibration damage of bearing
Inhibition takes in.
Summary of the invention
In view of the drawbacks of the prior art, it is an object of the invention to solve common electro-magnetic motor take three-phase windings and
Excitation winding shares the topological structure of a DC power supply, and there are what common mode current between excitation winding and three-phase windings circulated to return
Road, this common mode current may cause winding insulation damage and bearing vibration damage the technical issues of.
To achieve the above object, in a first aspect, the present invention provides a kind of electro-magnetic motor excitation unit, comprising: excitation around
Group, excitation winding buck circuit, isolated form DC/DC converter, three-phase windings and bus power supply；The bus power supply with it is described
Three-phase windings are connected, for providing busbar voltage for the three-phase windings；The input terminal of the isolated form DC/DC converter with
The bus power supply is connected, and output end is connected with the input terminal of the excitation winding buck circuit, is used for the bus
The busbar voltage that power supply provides carries out isolation no-load voltage ratio using as excitation winding buck circuit input voltage；The excitation winding buck
The output end of circuit is connected with the excitation winding, for carrying out copped wave to the busbar voltage after isolation no-load voltage ratio, after copped wave
End voltage of the obtained voltage as excitation winding passes through the isolated form between the excitation winding and the three-phase windings
DC/DC converter electrical isolation.
Optionally, the excitation winding buck circuit includes power device, the duty ratio D of the power device are as follows:
Wherein, vfoFor excitation winding end voltage, vfiFor excitation winding buck circuit input voltage, k is isolated form DC/DC
The no-load voltage ratio of converter, vdcFor busbar voltage.
Optionally, the parameter of the excitation winding includes: excitation winding the number of turns Nf, exciting current If, excitation winding impedance
Rf, specified magnetic linkage ψf, excitation winding end voltage vfoAnd excitation winding and around radical n；Relationship between parameters meets such as
Lower relational expression:
ψf∝NfnIf
Second aspect, the present invention provide a kind of parameter of electro-magnetic motor excitation unit provided based on above-mentioned first aspect
Acquisition methods, comprising:
Include according to three-phase windings busbar voltage size, excitation winding end voltage swing and excitation winding buck circuit
Power device change in duty cycle range selectes the variation range of isolated form DC/DC converter no-load voltage ratio；In the power device duty
Than in the variation range of variation range and the isolated form DC/DC converter no-load voltage ratio determine power device duty ratio value and every
The value of the no-load voltage ratio of release DC/DC converter, so that magnetic umber of turn, exciting current size and excitation winding and around radical
It meets the requirements.
Optionally it is determined that the value of the no-load voltage ratio of the duty ratio value and isolated form DC/DC converter of power device, so that magnetic
Umber of turn, exciting current and excitation winding simultaneously meet the requirements around radical, comprising the following steps:
1) a no-load voltage ratio value is chosen in the variation range of isolated form DC/DC converter no-load voltage ratio；
2) take excitation winding and be 1 around radical；
3) excitation winding the number of turns, exciting current size and excitation winding impedance magnitude at this time are determined according to specified magnetic linkage；
4) excitation winding end voltage is calculated；
5) the power device duty ratio that excitation winding buck circuit includes at this time is calculated；
6) judgment step 5) duty ratio of power device that is calculated whether be more than the power device duty ratio
Variation range continues step 7) if being more than, jumps to step 11) if being less than；
7) by excitation winding and add 1 around radical；
8) judgment step 7) obtain excitation winding and around radical whether be excitation winding and around radical be 1 when determine
The approximate number of excitation winding the number of turns, if then jumping to step 3), if otherwise continuing step 9)；
9) judge excitation winding and whether traversed excitation winding around radical and around radical for 1 when the excitation winding that determines
The approximate number of the number of turns, if then continuing step 10), if otherwise jumping to step 7)；
10) it chooses a no-load voltage ratio value again within the scope of the Turn Ratio Changing of isolated form DC/DC converter, jumps to step 2)；
11) terminate.
In general, through the invention it is contemplated above technical scheme is compared with the prior art, have below beneficial to effect
Fruit:
The present invention uses DC/DC isolated power supply, powers respectively to the excitation winding of motor and three-phase windings, overcomes tradition
There are problems that common mode current, isolated form DC/DC converter are based on single-end ortho-exciting or single-ended anti-between electro-magnetic motor double winding
Sharp or other principles take isolating transformer that will input and have carried out electrical isolation with output, pass through magnetic field transmission energy, block
The approach of common mode current transmission, plays the common mode current inhibited between excitation winding and three-phase windings, improves electrical excitation electricity
Stability when machine is run.Method and device provided by the invention has compatibility, is suitable for any electro-magnetic motor.
Detailed description of the invention
Fig. 1 is motor control main circuit diagram provided by the invention, wherein VdcIndicate DC voltage source, VfiIndicate excitation around
Group chopper circuit input voltage, VfoIndicate that excitation winding end voltage, Load indicate dissipative load, CdcIndicate bus capacitor, K1With
K2Indicate switch, Lf、CfAnd SfRespectively indicate the inductance, capacitor and power device of energized circuit chopper circuit；
Fig. 2 is the flow chart of electro-magnetic motor energized circuit parameter acquiring method provided by the invention.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.As long as in addition, technical characteristic involved in the various embodiments of the present invention described below
Not constituting a conflict with each other can be combined with each other.
The shortcomings that in order to overcome traditional electro-magnetic motor drive system, the present invention provide a kind of electro-magnetic motor energized circuit
Parameter acquiring method, to realize the inhibition of common mode current and excitation circuit chopper circuit between excitation winding and three-phase windings
The determination of parameter.
Fig. 1 is motor control main circuit diagram provided by the invention, comprising: excitation winding, excitation winding copped wave (buck) electricity
Road (Lf、CfAnd Sf), isolated form DC/DC converter, three-phase windings and bus power supply.Wherein, VfiIndicate energized circuit copped wave electricity
Road input voltage, VfoIndicate that excitation winding end voltage, Load indicate dissipative load, CdcIndicate bus capacitor,
Bus power supply is connected with three-phase windings, for providing busbar voltage V for three-phase windingsdc；Isolated form DC/DC transformation
The input terminal of device is connected with bus power supply, and output end is connected with the input terminal of excitation winding buck circuit, is used for bus
The busbar voltage that power supply provides carries out isolation no-load voltage ratio using as excitation winding buck circuit input voltage, the isolated form generally used
DC/DC converter is based on single-end ortho-exciting or single-ended reverse exciting or other principles, is to take isolating transformer that will input and export
Electrical isolation is carried out, by magnetic field transmission energy, the approach for having blocked common mode current to transmit plays the work for inhibiting common mode current
With；The output end of excitation winding buck circuit is connected with excitation winding, for cutting to the busbar voltage after transformation no-load voltage ratio
Wave, by adjust excitation winding buck circuit in power device duty ratio, adjust buck circuit output voltage, i.e., excitation around
The end voltage of group.
Optionally, excitation winding buck circuit includes power device, the duty ratio D of power device are as follows:
Wherein, vfoFor excitation winding end voltage, k is the no-load voltage ratio of isolated form DC/DC converter,vdcFor bus electricity
Pressure, vfiFor excitation winding buck circuit input voltage, i.e. isolated form DC/DC converter output voltage.
Optionally, the parameter of excitation winding includes: excitation winding the number of turns Nf, exciting current If, excitation winding impedance Rf, volume
Determine magnetic linkage ψf, excitation winding end voltage vfoAnd excitation winding and around radical n；Relationship between parameters meets following relationship
Formula:
ψf∝NfnIf
Wherein, referring to above-mentioned formula, can according to three-phase windings busbar voltage size, excitation winding end voltage swing and
The power device change in duty cycle range that excitation winding buck circuit includes selectes the variation of isolated form DC/DC converter no-load voltage ratio
Range；Power device is determined in the variation range of power device change in duty cycle range and isolated form DC/DC converter no-load voltage ratio
Duty ratio value and isolated form DC/DC converter no-load voltage ratio value so that magnetic umber of turn, exciting current size and
Excitation winding simultaneously meets the requirements around parameters such as radicals.
In one embodiment, a kind of electro-magnetic motor energized circuit determination method for parameter proposed by the present invention, including
Following steps:
A, according to the relationship between Rated motor magnetic linkage, excitation winding the number of turns, winding impedance, excitation winding end electricity is obtained
Pressure, exciting current, the relationship between excitation winding the number of turns.
Wherein, energized circuit basis electrical parameter relationship analysis, target are to obtain the feelings keeping Rated motor magnetic linkage constant
Relationship under condition, between motor excitation winding terminal voltage and exciting current and motor excitation winding winding mode.In Rated motor
In the case that magnetic linkage determines, Rated motor magnetic linkage is determining value, simultaneously according to motor magnetic linkage and excitation winding the number of turns, excitation winding
The relationship directly proportional around radical and exciting current, it is known that excitation winding the number of turns, excitation winding and around radical and exciting current size
Product be determining value.When radical increases, winding resistance is inversely proportional reduction with and around radical square, therefore according to ohm
Law, excitation winding end voltage and the product of exciting current and winding resistance are proportional, i.e., excitation winding end voltage with encourage
Magnetoelectricity stream is directly proportional, square is inversely proportional with and around radical.
B, according to three-phase windings line voltage size, excitation winding end voltage swing, while considering that the suitable excitation of selection is returned
Way switch pipe change in duty cycle range selectes the voltage class of isolated form DC/DC converter.
Wherein, the power device duty cycle range of the copped wave buck circuit in excitation winding and isolated form DC/DC transformation
The relationship analysis of device no-load voltage ratio.The duty ratio of this buck circuit power device is that excitation winding end voltage and isolated form DC/DC are converted
The ratio of device output voltage.Isolated form DC/DC converter no-load voltage ratio is isolated form DC/DC converter output voltage and DC bus electricity
The ratio of pressure, therefore excitation winding buck circuit duty ratio is also equal to buck circuit output voltage and busbar voltage and isolated form DC/
The ratio of the product of DC converter output voltage no-load voltage ratio.
C, determine energized circuit power device duty ratio adjusting range, at the same adjust motor excitation winding the number of turns and around
The no-load voltage ratio of radical, exciting current size and isolated form DC/DC converter is worth to reasonable.
Buck circuit power device duty is set in the case where considering enough control nargin and power device dead zone
Compare adjustable range.Line voltage, that is, busbar voltage of threephase armature winding is generally the not modifiable of determination according to application
Value.The method attempted using iteration, detailed process is as shown in Fig. 2, include the following steps:
1) the initial no-load voltage ratio for taking isolated form DC/DC converter is k；
2) the initial of excitation winding is taken and around radical n=1；
3) excitation winding the number of turns, exciting current size and excitation winding impedance magnitude at this time are determined according to specified magnetic linkage,
Wherein, specified magnetic linkage also is understood as magnetic loading；
4) excitation winding end voltage is calculated；
5) energized circuit power device duty ratio D at this time is calculated；
6) D continues step 7) if being more than, jumps to step 11) if being less than whether there is or not being more than setting range at this time for judgement；
7) n adds 1；
8) approximate number of the motor excitation umber of turn determined when whether judge n at this time be n=1, if then jumping to step 3),
If otherwise continuing step 9)；
9) approximate number for judging the motor excitation umber of turn determined when whether n has traversed n=1, if then continuing step
10), if otherwise jumping to step 7)；
10) k is chosen again, jumps to step 2)；
11) terminate, magnetic umber of turn, exciting current and excitation winding simultaneously meet the requirements around parameters such as radicals.
An isolated form DC/DC converter no-load voltage ratio is first selected, by motor excitation winding and 1 is set as around radical, according to motor
Specified magnetic linkage determines excitation winding the number of turns, exciting current size and excitation winding impedance, further according to the above parameter calculate excitation around
Group end voltage swing, verification at this time buck circuit power device duty ratio whether in scope of design.It is set if within this range
Meter terminates, and otherwise will and add 1 around radical, at the same must satisfy and around radical be and around radical be 1 when excitation winding the number of turns pact
Number continues plus 1 if being unsatisfactory for and around radical, until encountering so that parameter of the power device duty ratio in scope of design, or
Person has traversed all possible and around radical.If having traversed design item that is all possible and being still unsatisfactory for duty ratio around radical
Part then chooses an isolated form DC/DC converter no-load voltage ratio again, repeat it is above choose and the step of around radical, accounted for until meeting
The scope of design of empty ratio, it should be noted that scope of design, design condition are the allowed band of excitation unit parameters.
D, voltage class is output and input according to isolated form DC/DC converter, iterative modifications motor excitation winding and around root
Several and isolated form DC/DC converter no-load voltage ratio k designs energized circuit chopper circuit parameter, inductance and electricity including buck circuit
The selection of appearance, the selection of power device voltage, current class.
Electro-magnetic motor excitation unit and its parameter acquiring method provided by the invention, suitable for all electro-magnetic motors
Situation.This method is by design excitation winding parameter and selects isolated form DC/DC converter, in elimination system excitation winding and
Common mode current between threephase armature winding.Main includes setting busbar voltage, Rated motor magnetic linkage and energized circuit power device
Part duty cycle range, modifies isolated form DC/DC converter no-load voltage ratio and excitation winding and around radical repeatedly, so that actual duty cycle exists
In scope of design.The design method is compared with conventional method, eliminates the common mode access between energized circuit and three-phase circuit, is inhibited
Common mode current, and consider the optimization of power device duty ratio, to reach better power device control performance.Compared to other
Parameter acquiring method, method provided by the invention is relatively easy, has better implementation.
As it will be easily appreciated by one skilled in the art that the foregoing is merely illustrative of the preferred embodiments of the present invention, not to
The limitation present invention, any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should all include
Within protection scope of the present invention.
Claims (3)
1. a kind of parameter acquiring method based on electro-magnetic motor excitation unit, the electro-magnetic motor excitation unit includes: to encourage
Magnetic winding, excitation winding buck circuit, isolated form DC/DC converter, three-phase windings and bus power supply；The bus power supply with
The three-phase windings are connected, for providing busbar voltage for the three-phase windings；The input of the isolated form DC/DC converter
End is connected with the bus power supply, and output end is connected with the input terminal of the excitation winding buck circuit, and being used for will be described
The busbar voltage that bus power supply provides carries out isolation no-load voltage ratio using as excitation winding buck circuit input voltage；The excitation winding
The output end of buck circuit is connected with the excitation winding, for carrying out copped wave to the busbar voltage after isolation no-load voltage ratio, will cut
End voltage of the voltage obtained after wave as excitation winding, passes through the isolation between the excitation winding and the three-phase windings
Type DC/DC converter electrical isolation；It is characterised by comprising:
The power for including according to three-phase windings busbar voltage size, excitation winding end voltage swing and excitation winding buck circuit
Device change in duty cycle range selectes the variation range of isolated form DC/DC converter no-load voltage ratio；
Function is determined in the variation range of the power device change in duty cycle range and the isolated form DC/DC converter no-load voltage ratio
The value of the no-load voltage ratio of the duty ratio value and isolated form DC/DC converter of rate device, so that excitation winding the number of turns, exciting current are big
Small and excitation winding simultaneously meets the requirements around radical.
2. parameter acquiring method as described in claim 1, which is characterized in that determine the duty ratio value and isolation of power device
The value of the no-load voltage ratio of type DC/DC converter, so as to magnetic umber of turn, exciting current and excitation winding and be conformed to around radical
It asks, comprising the following steps:
1) a no-load voltage ratio value is chosen in the variation range of isolated form DC/DC converter no-load voltage ratio；
2) take excitation winding and be 1 around radical；
3) excitation winding the number of turns, exciting current size and excitation winding impedance magnitude at this time are determined according to specified magnetic linkage；
4) excitation winding end voltage is calculated；
5) the power device duty ratio that excitation winding buck circuit includes at this time is calculated；
6) judgment step 5) duty ratio of power device that is calculated whether be more than the power device duty ratio variation
Range continues step 7) if being more than, jumps to step 11) if being less than；
7) by excitation winding and add 1 around radical；
8) judgment step 7) obtain excitation winding and around radical whether be excitation winding and around radical be 1 when determine excitation
The approximate number of umber of turn, if then jumping to step 3), if otherwise continuing step 9)；
9) judge excitation winding and whether traversed excitation winding around radical and around radical for 1 when excitation winding the number of turns for determining
Approximate number, if then continuing step 10), if otherwise jumping to step 7)；
10) it chooses a no-load voltage ratio value again within the scope of the Turn Ratio Changing of isolated form DC/DC converter, jumps to step 2)；
11) terminate.
3. parameter acquiring method as described in claim 1, which is characterized in that the excitation winding buck circuit includes power device
Part, the duty ratio D of the power device are as follows:
Wherein, vfoFor excitation winding end voltage, k is the no-load voltage ratio of isolated form DC/DC converter, vfiIt is defeated for excitation winding buck circuit
Enter voltage, vdcFor busbar voltage.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710881406.9A CN107707171B (en) | 2017-09-26 | 2017-09-26 | A kind of electro-magnetic motor excitation unit and its parameter acquiring method |
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| CN201710881406.9A CN107707171B (en) | 2017-09-26 | 2017-09-26 | A kind of electro-magnetic motor excitation unit and its parameter acquiring method |
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| CN107707171B true CN107707171B (en) | 2019-09-27 |
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| CN114094897A (en) * | 2020-07-31 | 2022-02-25 | 华为技术有限公司 | Radio excitation system, detection method and electric automobile |
| CN112383987A (en) * | 2020-11-13 | 2021-02-19 | 山东旭程照明科技有限公司 | LED driving power supply and core parameter calculation method thereof |
| EP4297269A4 (en) * | 2021-03-30 | 2024-04-03 | Huawei Digital Power Tech Co Ltd | Electric drive system, drivetrain, heating method, and electric vehicle |
| CN113486554B (en) * | 2021-07-05 | 2024-01-30 | 杭州电子科技大学 | Excitation winding parameter calculation method for magnetic function integrated motor |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204928651U (en) * | 2015-08-27 | 2015-12-30 | 长沙广义变流技术有限公司 | Excitation control device for diesel locomotive |
| CN105790651A (en) * | 2016-04-26 | 2016-07-20 | 南京航空航天大学 | Control method of three-phase doubly salient brushless DC motor and driving system of three-phase doubly salient brushless DC motor |
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| PL2186188T3 (en) * | 2007-09-11 | 2012-03-30 | Abb Schweiz Ag | Method and apparatus for determining a field current in brushless electrical machines |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204928651U (en) * | 2015-08-27 | 2015-12-30 | 长沙广义变流技术有限公司 | Excitation control device for diesel locomotive |
| CN105790651A (en) * | 2016-04-26 | 2016-07-20 | 南京航空航天大学 | Control method of three-phase doubly salient brushless DC motor and driving system of three-phase doubly salient brushless DC motor |
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